Merge commit 'a4d34e218f548d381e09c483e8dc6ad18a8d571c'

* commit 'a4d34e218f548d381e09c483e8dc6ad18a8d571c':
  h264: disable ER by default

Conflicts:
	libavcodec/h264.c
	libavcodec/h264_picture.c
	libavcodec/h264_slice.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264.c

@@ -702,6 +702,12 @@ av_cold int ff_h264_decode_init(AVCodecContext *avctx)
 
     ff_h264_flush_change(h);
 
+    if (h->enable_er) {
+        av_log(avctx, AV_LOG_WARNING,
+               "Error resilience is enabled. It is unsafe and unsupported and may crash. "
+               "Use it at your own risk\n");
+    }
+
     return 0;
 }
 
@@ -1925,6 +1931,22 @@ static av_cold int h264_decode_end(AVCodecContext *avctx)
     return 0;
 }
 
+#define OFFSET(x) offsetof(H264Context, x)
+#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
+static const AVOption h264_options[] = {
+    {"is_avc", "is avc", offsetof(H264Context, is_avc), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
+    {"nal_length_size", "nal_length_size", offsetof(H264Context, nal_length_size), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0},
+    { "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
+    { NULL },
+};
+
+static const AVClass h264_class = {
+    .class_name = "H264 Decoder",
+    .item_name  = av_default_item_name,
+    .option     = h264_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 static const AVProfile profiles[] = {
     { FF_PROFILE_H264_BASELINE,             "Baseline"              },
     { FF_PROFILE_H264_CONSTRAINED_BASELINE, "Constrained Baseline"  },
@@ -1942,19 +1964,6 @@ static const AVProfile profiles[] = {
     { FF_PROFILE_UNKNOWN },
 };
 
-static const AVOption h264_options[] = {
-    {"is_avc", "is avc", offsetof(H264Context, is_avc), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
-    {"nal_length_size", "nal_length_size", offsetof(H264Context, nal_length_size), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0},
-    {NULL}
-};
-
-static const AVClass h264_class = {
-    .class_name = "H264 Decoder",
-    .item_name  = av_default_item_name,
-    .option     = h264_options,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
-
 AVCodec ff_h264_decoder = {
     .name                  = "h264",
     .long_name             = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),

libavcodec/h264.h

@@ -788,6 +788,8 @@ typedef struct H264Context {
     int parse_history_count;
     int parse_last_mb;
 
+    int enable_er;
+
     AVBufferPool *qscale_table_pool;
     AVBufferPool *mb_type_pool;
     AVBufferPool *motion_val_pool;

libavcodec/h264_picture.c

@@ -196,7 +196,7 @@ int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup)
      * past end by one (callers fault) and resync_mb_y != 0
      * causes problems for the first MB line, too.
      */
-    if (!FIELD_PICTURE(h) && h->current_slice && !h->sps.new) {
+    if (!FIELD_PICTURE(h) && h->current_slice && !h->sps.new && h->enable_er) {
         int use_last_pic = h->last_pic_for_ec.f.buf[0] && !sl->ref_count[0];
 
         ff_h264_set_erpic(&sl->er.cur_pic, h->cur_pic_ptr);

libavcodec/h264_slice.c

@@ -583,6 +583,7 @@ int ff_h264_update_thread_context(AVCodecContext *dst,
             return ret;
     }
 
+    h->enable_er       = h1->enable_er;
     h->workaround_bugs = h1->workaround_bugs;
     h->low_delay       = h1->low_delay;
     h->droppable       = h1->droppable;
@@ -711,7 +712,7 @@ static int h264_frame_start(H264Context *h)
         h->slice_ctx[i].uvlinesize = h->cur_pic_ptr->f.linesize[1];
     }
 
-    if (CONFIG_ERROR_RESILIENCE) {
+    if (CONFIG_ERROR_RESILIENCE && h->enable_er) {
         ff_er_frame_start(&h->slice_ctx[0].er);
         ff_h264_set_erpic(&h->slice_ctx[0].er.last_pic, NULL);
         ff_h264_set_erpic(&h->slice_ctx[0].er.next_pic, NULL);
@@ -2283,6 +2284,9 @@ static void er_add_slice(H264SliceContext *sl,
                          int startx, int starty,
                          int endx, int endy, int status)
 {
+    if (!sl->h264->enable_er)
+        return;
+
     if (CONFIG_ERROR_RESILIENCE) {
         ERContext *er = &sl->er;